Pacifier, arms, or CIO?

My 6 week old has reflux and when I lay him down to nap or for his night sleep, it seems the only thing to sooth him to sleep is the pacifier...horrible habit, I KNOW, but the only other alternative with him is to carry him till he falls asleep (not a great habit either), or to let him Cry it Out (which I think he is WAY too young for). So...am I right in using the pacifier if that's the only way he'll go to sleep? I hear parents saying how their kids don't sleep and they are exhausted, etc... I feel lucky that at least mine has something to sooth him. BTW... I tried to not give him the pacifier and he started shoving his thumb in his mouth...